Append media data section after transceivers
Append media data section after transceivers

Edge prechromium does not like app data section before video/audio.
It generates the following error:
0: Unable to get property 'state' of undefined or null reference
rtcpeerconnection.js (1016,1)

pion/webrtc,pion/webrtc,pion/webrtc,pion/webrtc